Stabilizing oscillation generators



'March 11,. 1924. 1,486,505

K. w. WAGNER STABILIZING OSCILLAIIION GENERATORS Filed June 28. 1923 llqavwemto'c KARL WILLY WAGNER Patented Mar. 11, 1924.

UNITED STATES PATENT OFFICE.

KARL WILLY WAGNER, OF BERLIN, GERMANY, ASSIGNOR TO RADIO CORPORATION 01'AMERICA, A CORPORATION OF DELAWARE.

STABILIZING OSCILLATION GENERATORS.

Application filed June 28, 1923. Serial No. 648,310.

To all whom it may concern:

Be it known that I, KARL WILLY WAGNER, a citizen of Germany, and aresident of Hallesclies Ufer 12/13, Berlin, S. W. 11, Ger- 5 many, haveinvented new and useful Improvements in Stabilizing OscillationGenerators (for which I have filed an application in Germany Oct. 14,1921), of which the following is a specification accompanied bydrawings.

This invention relates to an arrangement for Stabilizing the operationof oscillation generators which are utilized with a tuned or untunedload.

16 Generators adapted for the production of mechanical, acoustic,electrical, or other oscillations and waves are often used with loadswhich are tuned to a definite frequency, or else to a more orlessnarrowly limited fre- 20 quency range, this plan being eitherfollowed for the purpose of utilizing such oscillation generators mostefficiently or for the purpose of excluding the transmission to the loador consuming devices of secondary oscillations ofthe, generator.However, in this connection certain difficulties are often encountereddue to the reaction of the load upon such oscillation generator, whichdifiiculty among other things manifests itself by an alteration of thefrequency produced, the consequence being thatthe generator ceases to betuned to the load dealt with, and that it fails to yield its full power.Moreover, such change in the frequency is generally very undesirable. IIn accordance with German Patent No.

284,603 the said reaction produced by the tuned load upon theoscillation generator is reduced by the inclusion of resistance in theload whereby the resonance'curve of the latter is enlarged; however, theadvantage so ained is only realized at the expense of seectivity of theconsuming device or load. The same thing holds good of the arrangementdescribed in German Patent No. 298,4:82 in which the enlargement of theresonance curve is attained by a two-wave characteristic of the load. Ithas also been suggested to dissyntonize the load with relation to theoscillation generator, but this gives up the advantages realized by thetumng between the load and the generator.

Now, according to the present'invention the deviation of the oscillationgenerator is prevented by providing it with a supplemental load which isexternal with relation to the syntonized or primary load. A supplementalload is utilized which depends upon the frequency, in such a mannerthatthe supplemental load is low inside the range of the working frequency,while it increases greatly as soon as the frequency departs from theworking range in either an upward or downward direction. What isrealized thereby is that the total load of the generator is subject tobut little change with the frequency, the generator being by this meansrid of its tendency to deviate with relation to the load.

The invention is illustrated in the accompanying diagrams in which Fig.1 is a diagrammatic representation of a circuit embodying the invention.

Fig. 2 is a modification of Fig. 1 in which the supplemental load isdependent upon the frequency range of the generator.

Fig. 3 is a curve illustrating the characteristics of the arrangementshown in Fig. 2 and Fig. 4 is an arrangement in which the load issubstantially independent of the frequency.

Referring to Fig. 1, G is an electric oscillation generator whichcarries a syntonized or primary load circuit B.

The supplemental load consists of an inductance L and a capacity 0connected in parallel therewith, the circuit LC being tuned to excludethe working frequency, hence, for this frequency it possesses a veryhigh impedance, and it takes as a consequence only a very small current.Above and below the tuning frequency, the impedance of the said circuitis much lower so that the generator in the presence of a deviation ofthe frequency from its normal value becomes subject to a largesupplemental load which increases with the departure from suchfrequency. Byappropriate adjustment or proportioning of resistance R ordamping of the circuit LC, the value of the supplemental load can beregulated. 100 The effect of the dampingv is to flatten the resonancecurve of the tuned circuit LC and to increase the energy losses in thesupplemental load which would be zero in the ideal. case where theinductance has no resistance 105 and the condenser has no losses. By theproper selection of the ratio L: C the frequency deviation can beadjusted within, certain limits, within which the supplemental load willbecome effective or operative. Re- 110 load tuned Within a certainworkin to said tuned load comprising a. circuit in shunt to the load andgenerator and external to said connections, said circuit comprisinginductance, capacity and resistance and being tuned to substantiallyexclude the passage of the working frequency therethrough and to imposean increased supplemental load on the generator at nearby frequencies.

2. An arrangement for the stabilization of oscillation generatorscomprising in combination an oscillation generator; a primary frequencyrange, a supplemental stabilizing load connected to said generatorexternal to said tuned load comprising a shunt circuit including aninductance and a capacity in parallel and resistance in seriestherewith,

said shunt circuit being tuned to substantially exclude the workingfrequency and adapted to impose an increased supplemental load on thegenerator at nearby frequencies.

3. An arrangement for the stabilization of oscillation generatorscomprising in combination an oscillation generator, a primary loadadapted to operate within a certain working frequency range and asupplemental stabilizing load connected to said generator external tothe tuned load, said supplemental load comprising a lurality ofoscillatory circuits tuned to exc ude different frequencies within thelimits of the working range whereby eachof said tuned circuits isadapted to substantially exclude a portion of the frequencies within theWorking range and said combined circuits are adapted to impose anincreased supplemental load on the generator outside the limits of theworking frequency range.

4. An arrangement for the stabilization of oscillation generatorscomprising in combination an oscillation generator, a primary loadadapted to operate Within a certain working frequency range and asupplemental stabilizing load connected to said generator external tosaid tuned load, said supplemental load comprising a pair of oscillatorycircuits tuned to exclude different frequencies respectively near theupper and lower limits of the working range whereby each of said tunedcircuits is adapted to substantially exclude a portion, of thefrequencies within the working range and said combined circuits areadapted to impose an increased supplemental load on the generatoroutside the limits of the working frequency range.

KARL WILLY WAGNER.

